Do you need a wakeboard boat to do a front flip?

Yes and no with a wakeboard boat the hight of having a tower can help keep you in the air longer if you have a tower on you boat you should be

Fine but if you don't I suggest finding the speed at wich you can get the most hight off the wake do you

Don't get pulled down as hard but the easiest way to not have any of this affect you is to pul the handle tward your body on the way off the wake because it will give you slack in the line and you won't get pulled at all